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# Module providing the `SyncManager` class for dealing
# with shared objects
#
# multiprocessing/managers.py
#
# Copyright (c) 2006-2008, R Oudkerk
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
#
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in the
#    documentation and/or other materials provided with the distribution.
# 3. Neither the name of author nor the names of any contributors may be
#    used to endorse or promote products derived from this software
#    without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS "AS IS" AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.
#

__all__ = [ 'BaseManager', 'SyncManager', 'BaseProxy', 'Token' ]

#
# Imports
#

import os
import sys
import weakref
import threading
import array
import Queue

from traceback import format_exc
from multiprocessing import Process, current_process, active_children, Pool, util, connection
from multiprocessing.process import AuthenticationString
from multiprocessing.forking import exit, Popen, assert_spawning, ForkingPickler
from multiprocessing.util import Finalize, info

try:
    from cPickle import PicklingError
except ImportError:
    from pickle import PicklingError

#
# Register some things for pickling
#

def reduce_array(a):
    return array.array, (a.typecode, a.tostring())
ForkingPickler.register(array.array, reduce_array)

view_types = [type(getattr({}, name)()) for name in ('items','keys','values')]

#
# Type for identifying shared objects
#

class Token(object):
    '''
    Type to uniquely indentify a shared object
    '''
    __slots__ = ('typeid', 'address', 'id')

    def __init__(self, typeid, address, id):
        (self.typeid, self.address, self.id) = (typeid, address, id)

    def __getstate__(self):
        return (self.typeid, self.address, self.id)

    def __setstate__(self, state):
        (self.typeid, self.address, self.id) = state

    def __repr__(self):
        return 'Token(typeid=%r, address=%r, id=%r)' % \
               (self.typeid, self.address, self.id)

#
# Function for communication with a manager's server process
#

def dispatch(c, id, methodname, args=(), kwds={}):
    '''
    Send a message to manager using connection `c` and return response
    '''
    c.send((id, methodname, args, kwds))
    kind, result = c.recv()
    if kind == '#RETURN':
        return result
    raise convert_to_error(kind, result)

def convert_to_error(kind, result):
    if kind == '#ERROR':
        return result
    elif kind == '#TRACEBACK':
        assert type(result) is str
        return  RemoteError(result)
    elif kind == '#UNSERIALIZABLE':
        assert type(result) is str
        return RemoteError('Unserializable message: %s\n' % result)
    else:
        return ValueError('Unrecognized message type')

class RemoteError(Exception):
    def __str__(self):
        return ('\n' + '-'*75 + '\n' + str(self.args[0]) + '